Locking device for closet and lavatory doors



March 25,1930.

R. o. KRASSELT LOCKING DEVICE FOR CLOSET AND LAVATORY DOORS File d April 2, 1929 3 Sheets-Sheet 1 March 25, 1930.

LOCKING R. o. KRAssELT Filed April 2, 1929 an: n.0,

- 131/8 7210! Eyberl'" 0- DEVICE FOR CLOSET AND LAVATORY DOORS 3 Sheets-Sheet 2 March 25, 1930. R o. KRASSELT 1,751,821

LOCKING DEVICE FOR CLOSET AND LAVATORY DOORS Filed April 2, 1929 3 Sheets-Sheet 5 y 1 A I .414 v v M "men for Patented Mar. 25, 1930 UNITED STATES ROBERT OSKAR KRASSELT, F LEIPZIG, GERMANY LOCKING DEVICE IEOR CLOSET AND LAVATORY DOORS Applicationfiled April 2, 1929, Serial No.

The invention concerns that class of looking devices for closet and lavatory'doors in which the door is moved by a spring into a semi-open position'and held securely there by a locking device which engages in asocket, or hole, in a guide rail fixed to the door frame.

The advantage possessed by this class of locking device is that they permit of obser- 1 vation of the room when not in use but do not allow it to be entered without summoning the attendant or the insertion of a coin.

Hitherto it has only been possible to utilize this class of locking device for closets or lavatories which are permanently under the observation of an attendant whose interven tion Was available for releasing the locking device with the aid of a special key. The customary coin freed locking devices are not 90 capable of being used'for this class of looking device because the inserted coin must remain available for the backwardmovement of the locking bolt until the door is com- V pletely closed as, after the coin is inserted, the locking bolt must first be withdrawn from the locking socket and the door swung sufficiently open to enable the room to be entered and only then is the lock to be'actuated in such a way that the door may be completely closed. The inserted coinmust remain in a position to release the mechanism during the entire cycle of this opening and subsequent shutting ofthe door.

These requirements have been taken into consideration in the invention namely that the locking bolt is to be coupled to an auxiliary bolt which can be moved by hand the coin being retained in a definite location between both the bolts by gripping pieces which are formed with steps on them in such a position that itconnects the auxiliary to the locking bolt and cannot fall before the couple is broken by the action ofcompletely closing the door which must itself beopened sufiiciently to enable the sliding locking bolt to pass over a rising path thus permitting the coin to come to rest between the separated parts of the gripping pieces and having thus lost its support to fall freely down. Furthermore in accordance with in;

352,640, and in- Germany June 21, 1928.

vention precautions are taken that the looking socket provided for the spring actuated locking bolt cannot be improperly screened and the locking bolt thus prevented from en: gaging in the locking socket thus making it possible to close the, door without the insertion of a coin. Care is also taken to prevent opening from the outside, during use of the room, provided the door has been correctly closed. i a The drawings illustrate an'example of the application of the invention.

They show v Fig. 1 the interiorview of the door lock when the'door is closed.

Fig. 2 a sectional plan view of the locking mechanism when the door is in the securely held partially open position in thecondition shown in Fig. 1. I v v Fig. 3 a view showing part of the interior of the lock. r I

Fig. 4 a cross section of the lock with the rod for moving the bolt.

Figs. 57 a cross section of the the coin in various positions. a

Fig. .8 a sketch of the application in accordance with Fig. 4. a

Fig. 9 a portion of the partially opened door with the locking bolt dropped lnto the holding socket, shown in section.

Fig. 10 the door whilst be ng opened.

lock with i Fig. 11 a sketch of a portion of the guiding.

rail with its holding socket.

Fig. 12 another sketchrof Fig. 11.

Fig. 13 an interior view of the interlocking device for the closed door when the door is in the open position. i r

' Fig. 14 a sectional plan vlew. of F1g. 13.

Fig. 15 the position of the interlock ng device when the door is in the closed position.v

Fig. 16 a sectional plan view of Fig. 15.

Fig. 17 a view" of the exterior of a door provided with the interlocking devlce. v

The locking bolt a? subjected to the pressure of the spring 6 is fixed inslde a lock container (see Figs. I the .rail FcZ? which is attached to the door frameand has in it at" an appropriate. dlstancefrom thedoor frame a locking socket 9 and 10) and slides over lOQ g (see Fig. 10) arranged in such a manner that if the bolt a has passed into the socket the door will remain open to such an amount that a narrow slit is left sufiicient to permit a View into the room but which will not permit anybody topass into it (see Fig. 9).

Inside the lock container the locking bolt a is provided with a block it in the side of which there is'anopen coin passage "(see Figs. 1 and placed, inside the lock container parallel to the locking bolt a and arranged to be withdrawable against tl e pressure of the spring Z2 by means of the cam shaft m (see Figs. 1 and 2). his cam shafthas a handle at tached to both ends so that it can be actuated fromeither side of the door (see Fig. 10);

Inside the lock container below the bolts a 7691a plate at with a perforation n isfixe'd' whi'ch is held by the latching links '0 which move on the axes 2' (see Figs.

2-7) both the latching links are held'by springs f pressed against stops, not shown in the drawing, so that they occupy the positions shown in Fig. 2 and Figs. 5 and'l'.

' The latchinglinks are shaped with inwa'rdly' directed slants behind whichthey have stepped surfaces. p V If thedoor is to be freed the coin is-inserted in the customary aperture and passing through the coin way' falls into the slot in thef block h resting between'the slanting front parts of the latching links 0' (see igi2)'. If the'cam shaft m is now turned in-a suitablenianner the auxiliary bolt --7c in the lock is lr'awn' back and itsjhook 7a, with, the aid of the coin compels the locking bolt'to combine "n the movement t itto, be. w awnlnoin the holding sockeflg in the lockingrail fd. 1

V This movement gripsthe coin between the two bolts a 211.4% and 'it is forced beyond the noses ofthe V latching links fo where it ifs 'h'eldfirmly-behind thefirst steps of the latching links whentheshaft' m is released -(see Fig..5)11

Wheirthe door duite shut the locking toltr'iseson a track (see Figs. 9-10) on the inside of the locking track during which the coin is ableto remain behind the second step offthelatching link (see Fig. '6) and then to'be released andfree to drop downJ' 1 When the door is opened after the. room hasl'been used thelocking lever a pushes in;the ,well.knownimanner cover 11.7 ofthe locking socket g in front of 1t'(seeF1gs'.

6 and 10) so as to enable it to passoverthe covered-socket g 'lhe subsequent closing movement ofthe oor is followedfby a drop: pingof the bolt (2 into the locking'socket 5g? which. retains .thedoor in the partially (see Figs-7 and- 9). V To prevent any interference vresulting f am ne insertion of. falsecoins the coin in? leti. is provided with Com tester that is The auxiliary bOlt'7fi is put into operation by every closing motion of the door, and also swung forwards by every utilization of the cam shaft m.

The coin inlet passage 9 of the coin tester comprises the fixed inclined wall 1" and the wall 1" which can be moved on the hinge 8 (see Figs. 1 and 3) and which is pressed by springs (not shown) against the wall 1". The coin which is inserted, if a thin false coin fa is through the narrow slot (not shown) from the passage g into the ejector run-way o and is thus ejected.

False coins of the: correct thickness but of incorrect diameter will run through the coin passage but will be held by other well known means from actuating the releasingmechanism. 'Other coins which dueflto their pecnliaritybecome wedged in the coin passage and consequently interfere, with the opera. tion can be'gotrrid of as the lower part of they inclined passage wall of the coin tester a can be opened by pressure against the spring pressed wall 1*. V Thisis. moved by the bolt 70 actuated by the releasing part ('1 which i's'held 'so as to be able toflmove freely around the pin 3) on the rectangular piece (2) tolthe extent allowed by the slot (5) therein receiving a-guide-and limitation pin (6) attached to the bolt 7a" (see Figs. 2 and 8). It is advisable to providethe apparat'us. with the coininlets 'or coin testers onhothsides, as the releasing part .(4) is" so contrived-that for each outward swing both passages of the coin tester are opened, When the door is fully closed the locking bolt a is pushed backlinto the lock by the rising part of'the guiding rail FcZ (Figs; 9 and 10). thus enabling the block it to force. upwards the pin 2' against thefwall r .(see'Figs. land 3);, By this means th'einserted coins are immediately ejected and unable to reach the freeing mechanism at inopportune times i. e. when the room has been use W In orderto preventthe push .piecetp) of the ,covcredlocki'ng slot ofthe guidingra'il (d) being covered by assisting. means not belongingv to .-.th e'device during the closing movement which follows the opening of the door thejgniding rail ((1), isv :made. with a closed entry into the innerpart of which the lockingboltpasses'when thedooris closed niovin'g a 'flapwhich during the further clos-v lgo Inside the enclosed screened uiding rail ((Z) there'is attached at a suitc ble distance from and opposite to its upper surface a running track (d) in which is the holding socket for the locking bolt (a), which is, with advantage, provided with a. roller The push plate (g9) is forced during the opening of the door by the pressure of the locking bolt a) over the entry to the locking socket. The front end of the locking bolt passes along a slot, of dimension appropriate to the size of locking bolt (see Figs. 11 and 12) fixed at that part of the guiding rail and having a channel formed bent or angular flap movable about the pin (y) which generally remains in such a position that its front opening is in the vicinity of the projecting opening of the guiding rail (cl) (see Figs. 11 and 12).

hen closing the previously opened door (see Fig. 1) the locking bolt will project into the housing ((1) and the channel form flap X will be swung around. on its pin 3/ in such a manner that finally the front opening of the housing ((Z) will be screened or in other words the closing of the door is, until the locking bolt (0,) enters the socket (g), only possible when no foreign bodies are inside the housing (d). As in addition to this that can only be opened from the inner the front edge of the door when it. is being closed will sweep along the upper surface of guiding rail, it is also impossibleto force back the bolt (a) by any supplementary aids, against the pressure of its actuating spring,as it is obvious that the movement of the looking bolt (a) is so limited in this direction that it can only enter the front portion of the housing ((1). The arrangement shown in Figs. 4 and 8 is provided to enable the at tendant to open the door, without using a coin, by means of a socketed key. The socketed key is pushed over the squared spindle 7 which is firmly attached to the lever 9. The connecting links 10 and 11 are attached to the bell crank lever 11 which moves around a pin 13 fiXed to the projecting part of the container and to lever '9 and to the block When the squared spindle is turned by means of the socketed key the lever 9 moves around'the axis 8 towards one side and moves the block 71. through the intervention of the parts 10, 11 and 14-. As the locking bolt only retains the door in a. semi-open position the retention of the door in a completely closed position must be effected by an interlocking device side.

The interlocking device canwith advan-v tage be combined with the indicator signal which shows whether the room is occupied or free (see Figs. 13 to 17) and comprises a locking receptacle 16 fixed to the door frame having'a bolt 15 whicn is permenently pressed outwards by the spring 17, and a lock 19 attached to the door in such a manner that the auxiliary bolt 18 is opposite to the bolt 15 The auxiliary bolt 18 is geared through the toothed gear wheel to the actual locking bolt '18. -The spindle 24 belonging to the toothed wheel is, together with the pressure handle 23, fixed on the inner side of the-door whilethe indicating plate 22 (Fig. 17 is on the outer side together with a fiat sidedattach .ment which permits the attendant, in case of forced into the locking receptacle and the door is consequently securely bolted.

What I claim asiny invention and desire to secure by Letters'Patent of the-;United States is 1. A coin controlled locking mechanism for doors for locking the door in apart-1y open position and upon the insertion. of a coin permitting of the, door being unlocked and opened and the locking. mechanism retained by the inserted coin in position to permit of the door being fully closed and locked'when closed, said mechanism comprising normally disconnected automatically projectible main and auxiliarylocking'bolts on the door, a

locking device on the door frame having a keeper, engageable respectively by'said bolts.

for locking the door in partly open and closed positions, and a part for holding the main boltiretracted when the dooris closed, coin holding and releasing means for coupling the main bolt with the auxiliary bolt, and means for shiftingthe auxiliary locking bolt to retract the main locking bolt on'a coupling connection being effected by a coin. I V

2'. A coin "controlled door locking mechanism of the character set forth in claiinl wherein themeansfor shifting the auxiliary locking bolt comprises amanuallyoperable element .actuable to retract the mainlocking boltthrough the auxiliary locking bolt and then torelease the latter for a locking action.

'3. Acoin' controlled door locking mechanism of'the character set forthinclaim 1 wherein the locking device on the door frame comprlses a channeled keeper having a keepor opening'and asurface for action on the or opening and a guide rail having an mbolt to hold the bolt retracted.

5. A coin controlled door locking mechaclined surface for action on the main locking nism of the character set forth in claim l wherein the locking device on the door frame comprises ,a channeled keeper having a keeper opening. a surface forlaction on the main locking bolt to hold said Ibolt retracted, and a CO'VPfOI'ItllG openingshiftable by the bolt to cover and uncover said opening.

-16. A coin controlled door locking inechanism of the character set forth in claim 1 wherein the loclnng device on the door frame comprises :a channeled vkeeper hav ng an entranceway, a keeper opening'to receive the :bolts .a surface for act-ion on the main lock- 7 ing bolt to hold said .bolt'retracted, and a pivoted guard for closing said :entranceway and adapted to open under pressure of the entering main bolt.

A locking device in accordance with claim 1 having a coin insertion passage terrninating in a block fixed to the main locking'bolt and having .a coin slot opening in the direction of the auxiliary bolt, and means engageable by the coin in said opening to couple the bolts so that when the auxiliary EbOlt is thrown back the main locking bolt is caused bvpressure of the coin against it to be retracted.

.8. A locking device 1n accordance with claim 1 including a slotted coin receivingmember fixed to the main locking bolt and pivoted dogs carried by the bolts and each having an inclined nose :and abutment shoulders at different distances from the nose for engagement of the coin therewith, whereby V the inserted coin is connected to and couples the bolts for conjoint movement.

'9. A locking device in accordance with claim 1 in which the coin holding and releasing means includes a slotted coin receiving member carried by the main locking boltoand means carried byithe bolts for engagement with the coin, whereby the bolts are coupled, and a coin conductor leading to the slotted coin receiving device andhaving arranged therein a retarder governing the passage of the coin. 7

10. A locking device in accordance with claim 1 wherein means are provided for 'retract-111g the auxiliary locking bolt from 7 either side ofthe door.

In witness whereof I havesigned this specification:

ROBERT 'OSKAR KRA'SSELT. 

